| // Copyright (C) 2019-2021 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // { dg-options "-std=gnu++2a" } |
| // { dg-do run { target c++2a } } |
| |
| #include <ranges> |
| #include <utility> // as_const |
| #include <testsuite_hooks.h> |
| #include <testsuite_iterators.h> |
| |
| static_assert(__gnu_test::is_customization_point_object(std::ranges::end)); |
| |
| using std::same_as; |
| |
| void |
| test01() |
| { |
| int a[2] = {}; |
| |
| // t + extent_v<T> if E is of array type T. |
| |
| static_assert(same_as<decltype(std::ranges::end(a)), decltype(a + 2)>); |
| static_assert(noexcept(std::ranges::end(a))); |
| VERIFY( std::ranges::end(a) == (a + 2) ); |
| } |
| |
| void |
| test02() |
| { |
| using __gnu_test::test_range; |
| using __gnu_test::random_access_iterator_wrapper; |
| using __gnu_test::input_iterator_wrapper; |
| using __gnu_test::output_iterator_wrapper; |
| |
| int a[] = { 0, 1 }; |
| |
| // Otherwise, decay-copy(t.end()) if it is a valid expression |
| // and its type S models sentinel_for<decltype(ranges::begin(E))>. |
| |
| test_range<int, random_access_iterator_wrapper> r(a); |
| static_assert(same_as<decltype(std::ranges::end(r)), decltype(r.end())>); |
| VERIFY( std::ranges::end(r) == std::ranges::next(r.begin(), 2) ); |
| |
| test_range<int, input_iterator_wrapper> i(a); |
| static_assert(same_as<decltype(std::ranges::end(i)), decltype(i.end())>); |
| VERIFY( std::ranges::end(i) == std::ranges::next(i.begin(), 2) ); |
| |
| test_range<int, output_iterator_wrapper> o(a); |
| static_assert(same_as<decltype(std::ranges::end(o)), decltype(o.end())>); |
| VERIFY( std::ranges::end(o) == std::ranges::next(o.begin(), 2) ); |
| } |
| |
| struct R |
| { |
| int a[4] = { 0, 1, 2, 3 }; |
| |
| const int* begin() const; |
| friend int* begin(R&&) noexcept; |
| friend const int* begin(const R&&) noexcept; |
| |
| // Should be ignored because it doesn't return a sentinel for int* |
| const long* end() const; |
| |
| friend int* end(R& r) { return r.a + 0; } |
| friend int* end(R&& r) { return r.a + 1; } |
| friend const int* end(const R& r) noexcept { return r.a + 2; } |
| friend const int* end(const R&& r) noexcept { return r.a + 3; } |
| }; |
| |
| struct RV // view on an R |
| { |
| R& r; |
| |
| const int* begin() const; |
| |
| friend int* end(RV& v) noexcept { return end(v.r); } |
| friend const int* end(const RV& v) { return end(std::as_const(v.r)); } |
| }; |
| |
| // Allow ranges::begin to work with RV&& |
| template<> constexpr bool std::ranges::enable_borrowed_range<RV> = true; |
| |
| void |
| test03() |
| { |
| R r; |
| const R& c = r; |
| |
| // Otherwise, decay-copy(end(t)) if it is a valid expression |
| // and its type S models sentinel_for<decltype(ranges::begin(E))>. |
| |
| static_assert(same_as<decltype(std::ranges::end(r)), decltype(end(r))>); |
| static_assert(!noexcept(std::ranges::end(r))); |
| VERIFY( std::ranges::end(r) == end(r) ); |
| |
| static_assert(same_as<decltype(std::ranges::end(c)), decltype(end(c))>); |
| static_assert(noexcept(std::ranges::end(c))); |
| VERIFY( std::ranges::end(c) == end(c) ); |
| |
| RV v{r}; |
| static_assert(same_as<decltype(std::ranges::end(std::move(v))), |
| decltype(end(r))>); |
| static_assert(noexcept(std::ranges::end(std::move(v)))); |
| VERIFY( std::ranges::end(std::move(v)) == end(r) ); |
| |
| const RV cv{r}; |
| static_assert(same_as<decltype(std::ranges::end(std::move(cv))), |
| decltype(end(c))>); |
| static_assert(!noexcept(std::ranges::end(std::move(cv)))); |
| VERIFY( std::ranges::end(std::move(cv)) == end(c) ); |
| } |
| |
| struct RR |
| { |
| short s = 0; |
| long l = 0; |
| int a[4] = { 0, 1, 2, 3 }; |
| |
| const void* begin() const; // return type not an iterator |
| |
| friend const short* begin(RR&) noexcept; |
| short* end() noexcept { return &s; } |
| |
| friend const long* begin(const RR&) noexcept; |
| const long* end() const { return &l; } |
| |
| friend const int* begin(RR&&) noexcept; |
| friend int* end(RR&) { throw 1; } // not valid for rvalues |
| friend int* end(RR&& r) { return r.a + 1; } |
| |
| friend const int* begin(const RR&&) noexcept; |
| friend const int* end(const RR&) { throw 1; } // not valid for rvalues |
| friend const int* end(const RR&& r) noexcept { return r.a + 3; } |
| }; |
| |
| // N.B. this is a lie, end on an RR rvalue will return a dangling pointer. |
| template<> constexpr bool std::ranges::enable_borrowed_range<RR> = true; |
| |
| void |
| test04() |
| { |
| RR r; |
| const RR& c = r; |
| VERIFY( std::ranges::end(r) == &r.s ); |
| static_assert(noexcept(std::ranges::end(r))); |
| |
| VERIFY( std::ranges::end(std::move(r)) == &r.s ); |
| static_assert(noexcept(std::ranges::end(std::move(r)))); |
| |
| VERIFY( std::ranges::end(c) == &r.l ); |
| static_assert(!noexcept(std::ranges::end(c))); |
| |
| VERIFY( std::ranges::end(std::move(c)) == &r.l ); |
| static_assert(!noexcept(std::ranges::end(std::move(c)))); |
| } |
| |
| int |
| main() |
| { |
| test01(); |
| test02(); |
| test03(); |
| test04(); |
| } |